Not really sure you are researching this very well Rod... The sequel to Dr. Dolittle was a household name -- they knew what the first one was about, and it was very well recevied the first time around... Thus, it was going to do well the second time around. Dr Dolittle 2 was also released in late June -- smack in the middle of summer so all of the kids are out of school. I know for certain that on May 9th, there are still *many* kids still in school for another few weeks. In addition to that, Dr. Dolittle 2 opened to more screens, and much bigger advertising budget. How many Daddy Day Care previews have you seen? Not many.
Your comparison to Fast and the Furious is a bit flawed, in that its not exactly the target market. People that went to see Dr. Dolittle 2 weren't going to be deciding between it and "Fast and the Furious"... One was a teenage+ movie, the other was a kid's movie.
On the other hand, X-Men 2 is seen as a "comic book movie". Granted, educated parents will know that its not a movie that young kids need to be going to see, but there's a whole lotta uneducated parents out there... My point is, Fast and the Furious wasn't going to take away from Dr. Dolittle 2's sales, but X-Men 2 *WILL* take away from Daddy Day Care's sales.
IMO, *much* better value still on the board with Hulk vs Matrix and Charlie's Angels vs Bruce Almighty.